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A kind of intelligent killing method and device of complex pressure system formation

A formation and pressure technology, used in earth-moving drilling, flushing wellbore, wellbore/well components, etc., can solve the problems of relying on manual experience, low success rate, high risk, etc., achieving no manual operation delay, timely monitoring, Engineering reliable results

Active Publication Date: 2022-07-26
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the lack of intelligent well killing control methods and supporting equipment, more reliance on manual experience, the current well killing success rate is low and the risk is high

Method used

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  • A kind of intelligent killing method and device of complex pressure system formation
  • A kind of intelligent killing method and device of complex pressure system formation
  • A kind of intelligent killing method and device of complex pressure system formation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0155] An intelligent killing method for a formation with a complex pressure system, comprising the following steps:

[0156] (1) Real-time monitoring of downhole-surface real-time information, downhole-surface real-time information includes inlet / outlet drilling fluid flow difference, drilling fluid temperature, density, mud resistivity, riser pressure, mud pool increment, hook load;

[0157] (2) Process the real-time downhole-surface information monitored in real time in step (1) to judge downhole working conditions. If downhole abnormality occurs, real-time inversion of formation pressure and formation permeability, and real-time inversion of wellbore multiphase flow model medium uncertain parameters, dynamic simulation calculation of wellbore pressure distribution;

[0158] (3) Send out control signals, intelligently optimize the design of throttling control parameters, including the connection method of the throttling valve and the pressure drop distribution scheme, adjus...

Embodiment 2

[0160] According to a kind of intelligent killing method of complex pressure system formation described in Embodiment 1, the difference is:

[0161] In step (2), processing the real-time information of the downhole-surface monitored in real-time in step (1), and judging the downhole working condition, refers to: performing early overflow monitoring in combination with the real-time downhole data, and the specific steps are as follows:

[0162] Collect overflow monitoring data from downhole PWD101 X=[X 1 ,X 2 ,…X i ,…X m ], X i are different overflow detection parameters, which are discrete data sequences that change with time t, also denoted as x i (t), i=1,2,...,m, m is the length of the collected data, for a certain time interval t∈[n-L+1,n], L is the time window, and n is an arbitrarily selected time interval The starting point of , and its corresponding x(t) is approximately expressed by the local linear regression model as formula (I):

[0163] x(t)=k(n)t+b(n) (I) ...

Embodiment 3

[0189] According to a kind of intelligent killing method of complex pressure system formation described in embodiment 1, its difference is:

[0190] In step (2), the real-time inversion of formation pressure and formation permeability refers to:

[0191] After gas invasion occurs during drilling, the fluid composition and flow rate in the annulus will change when the reservoir fluid enters the wellbore. By measuring parameters such as pressure and flow rate, the reservoir parameters can be deduced inversely. The gas intrusion process is similar to the unstable well testing process, so certain formation information can be represented based on the changes of gas intrusion response parameters (vertical pressure, outlet flow, mud pool increment, etc.), thus realizing formation information inversion before well shut-in.

[0192]Since the gas invasion is slow in the early stage of gas invasion and the expansion rate is extremely small, the bottom-hole gas production rate can be obta...

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Abstract

The invention relates to an intelligent killing method and device for a complex pressure system formation, including: (1) real-time monitoring of the real-time information of the downhole-surface; (2) processing the real-time information of the downhole-surface, judging the downhole working condition, and if the When the downhole is abnormal, on the one hand, the uncertain parameters in the wellbore multiphase flow model are inverted in real time, and on the other hand, the wellbore pressure distribution is dynamically simulated and calculated; (3) the control signal is issued, and the throttling control parameters are intelligently optimized and designed, including the connection of the throttling valve. The method and pressure drop distribution plan can adjust the wellhead pressure in real time to maintain the bottom hole pressure constant, and at the same time, track the vertical pressure feedback of casing pressure, and intelligently optimize and adjust the well killing control plan through the feedback structure. The invention can automatically monitor the downhole working conditions in the whole process and in real time, and intelligently invert the formation pressure information according to the change trend of the measurement information, so as to achieve the purpose of abnormally accurate downhole, timely monitoring, and intelligent identification of formation information of a complex pressure system.

Description

technical field [0001] The invention relates to an intelligent killing method and device for complex pressure system strata, belonging to the field of petroleum exploration and development. Background technique [0002] With the continuous expansion of the country's demand for oil and gas resources, complex geological structures and scattered oilfield blocks have become hot spots in oil and gas exploration and development work. However, at the same time, drilling projects are faced with the development of faults, fractures, high-steep structures, etc., the formation pressure system is complex, and the formation Problems such as information uncertainty lead to frequent occurrence of abnormally high-pressure well sections, and the safety density window of drilling fluid is narrow, and gas invasion and kick accidents are very likely to occur. This has led to difficulties such as low first-time success rate and high risk of well killing. [0003] The multiphase flow law of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/00E21B21/08E21B47/06E21B47/07E21B49/00
CPCE21B47/00E21B21/08E21B47/06E21B49/00
Inventor 王志远仉志孙宝江夏安迪孙小辉
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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